AISI 501B Martensitic Stainless Steel Chemical Composition, Grades, Tables and Online Pdf

AISI 501B is a common type of stainless steel which has a reputation for being highly resistant to corrosion as well as high strength. The carbon composition of iron ranges from 0.50%, while the chromium amount is between 12 and 14%, and the presence of other elements such as manganese, silicon, phosphorus, sulfur, iron is relatively small. This composition endows amazing mechanical properties by which those materials involve extensive applications in the industrial field as automotive components, surgical tools, and aircraft structures due to their high strength and corrosion resistance. AISI 501B, having been hardened and tempered, reveals better qualities for toughness and resistance to abrasion. The chart of grades and the fold-out PDF resources offer the engineer or designer a clear view of the material's mechanical, thermal and chemical properties, allowing for the selection of materials and the improvement of application solutions.

AISI 501B Martensitic Stainless Steel Chemical Composition And Grade Table

AISI 501B is the superior martensitic stainless steel having the best corrosion resistance and high strength properties. The largest component of it is carbon, and it includes other elements as manganese, silicon, chromium, and small proportions of some others. In particular, it generally has between 0.15-0.20% carbon, 1.00% manganese, 1.00% silicon, and 1.00% chromium contents, with the sulfur and phosphorus being present in very small amounts. AISI 501B, by the name, is a martensitic stainless steel, which is famous for its hardenability through heat treatment and, thus, suitable for use in automotive, aerospace and manufacturing industries.

AISI 501B Martensitic Stainless Steel
Elements C Si Mn P S Cr Mo
Min (%) - 0.50 0.03 - - 8.00 0.90
Max (%) 0.15 1.00 0.60 0.03 0.03 10.0 1.10

Advantages and Disadvantages of AISI 501B Martensitic Stainless Steel


  • Higher Corrosion Resistance: Better corrosion resistance than AISI 501A in certain conditions.

  • Moderate Toughness: Offers superior toughness compared to AISI 501A, reducing the risk of brittle failure.

  • Heat Treatable: Can be heat treated to increase alloy strength.

  • Suitable for High-Temperature Applications: Good mechanical strength for use in high-temperature environments.


  • Limited Weldability: Requires careful handling during welding to prevent cracks and preserve properties.

  • Cost: More expensive due to alloying elements.

  • Moderate Corrosion Resistance: Not as corrosion resistant as austenitic stainless steels.

  • Limited Availability: May not be as readily available as common stainless steel grades.

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